Taste Kid') is a Japanese manga series written and illustrated by Daisuke Terasawa about a young boy cook.
One day, Genjirou Murata appears in the restaurant and is surprised at the delicious taste and delicate culinary skills of the katsudon prepared by Youichi.
Subsequently, Youichi is invited to the Ajiou (literally meaning taste emperor) Building in which he is involved in a spaghetti match with the in-house Italian chef, Marui.
It serves cheap, simple Japanese fare and is largely patronized by working-class people, but as Youichi defeats more and more opponents, the winning dishes are added to the menu periodically.
While it is never directly stated what the Ajiou Group does, it can be assumed they have restaurant chains, training schools, and other products related to cooking.